EP0686869A3 - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
- Publication number
- EP0686869A3 EP0686869A3 EP95108743A EP95108743A EP0686869A3 EP 0686869 A3 EP0686869 A3 EP 0686869A3 EP 95108743 A EP95108743 A EP 95108743A EP 95108743 A EP95108743 A EP 95108743A EP 0686869 A3 EP0686869 A3 EP 0686869A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid crystal
- retardation film
- retardation
- optical axis
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/40—Materials having a particular birefringence, retardation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/01—Number of plates being 1
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/02—Number of plates being 2
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/12—Biaxial compensators
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/13—Positive birefingence
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US255971 | 1994-06-08 | ||
US08/255,971 US5576861A (en) | 1993-12-15 | 1994-06-08 | Liquid crystal display having a retarder with 100-200nm retardation and having high contrast viewing zone centered in positive or negative vertical region |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0686869A2 EP0686869A2 (en) | 1995-12-13 |
EP0686869A3 true EP0686869A3 (en) | 1996-06-12 |
EP0686869B1 EP0686869B1 (en) | 2002-03-13 |
Family
ID=22970620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95108743A Expired - Lifetime EP0686869B1 (en) | 1994-06-08 | 1995-06-07 | Liquid crystal display |
Country Status (5)
Country | Link |
---|---|
US (4) | US5576861A (en) |
EP (1) | EP0686869B1 (en) |
AT (1) | ATE214492T1 (en) |
CA (1) | CA2151291C (en) |
DE (1) | DE69525790T2 (en) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5576861A (en) * | 1993-12-15 | 1996-11-19 | Ois Optical Imaging Systems, Inc. | Liquid crystal display having a retarder with 100-200nm retardation and having high contrast viewing zone centered in positive or negative vertical region |
US5657140A (en) * | 1993-12-15 | 1997-08-12 | Ois Optical Imaging Systems, Inc. | Normally white twisted nematic LCD with positive and negative retarders |
US6292242B1 (en) * | 1993-12-15 | 2001-09-18 | Ois Optical Imaging Systems, Inc. | Normally white twisted nematic LCD with positive uniaxial and negative biaxial retarders |
DE69733987T2 (en) * | 1996-05-17 | 2006-06-22 | Koninklijke Philips Electronics N.V. | EXPANSION |
JP3292809B2 (en) * | 1996-09-25 | 2002-06-17 | 松下電器産業株式会社 | Color liquid crystal display device |
US6028656A (en) * | 1996-10-09 | 2000-02-22 | Cambridge Research & Instrumentation Inc. | Optical polarization switch and method of using same |
JP3452755B2 (en) * | 1997-04-07 | 2003-09-29 | シャープ株式会社 | Liquid crystal display |
US5990997A (en) * | 1997-06-05 | 1999-11-23 | Ois Optical Imaging Systems, Inc. | NW twisted nematic LCD with negative tilted retarders for improved viewing characteristics |
US6567143B1 (en) | 1997-06-05 | 2003-05-20 | Guardian Industries Corp. | NW twisted nematic LCD with negative and tilted retarders on each side of liquid crystal cell to improve vertical contrast ratios |
US5982465A (en) * | 1997-07-11 | 1999-11-09 | Rockwell International Corporation | Film compensated normally white super-twist nematic liquid crystal display that reduces chromaticity shifts over large temperature and viewing angle range |
US6577368B1 (en) | 1997-11-03 | 2003-06-10 | Samsung Electronics Co., Ltd. | IPS-LCD having a third electrode having aperture and formed on counter substrate |
WO2000031579A1 (en) * | 1998-11-20 | 2000-06-02 | Koninklijke Philips Electronics N.V. | Image projection system with improved contrast |
US6680766B1 (en) * | 1998-12-31 | 2004-01-20 | Honeywell Inc. | Liquid crystal display wherein twist angle of liquid crystal material differ from 90° by approximately 15° or more |
US6359671B1 (en) | 2000-02-23 | 2002-03-19 | Planar Systems, Inc. | High contrast liquid crystal device |
DE60106327T2 (en) * | 2000-05-31 | 2006-02-23 | Sony Corp. | Liquid crystal projector with improved contrast |
KR100695297B1 (en) * | 2000-06-13 | 2007-03-14 | 삼성전자주식회사 | Liquid Crystal Display Having Wide Viewing Angle Using The Compensation Film |
JP2002207213A (en) | 2001-01-11 | 2002-07-26 | Hitachi Ltd | Liquid crystal display element or display device using the same |
ES2844273T3 (en) | 2001-02-27 | 2021-07-21 | Dolby Laboratories Licensing Corp | Method and device for exposing an image |
US8687271B2 (en) | 2002-03-13 | 2014-04-01 | Dolby Laboratories Licensing Corporation | N-modulation displays and related methods |
WO2003077013A2 (en) | 2002-03-13 | 2003-09-18 | The University Of British Columbia | High dynamic range display devices |
AU2003249005A1 (en) * | 2002-07-19 | 2004-02-09 | Fuji Photo Film Co., Ltd. | Liquid crystal projector, liquid crystal device and substrate for liquid crystal device |
US6805924B1 (en) * | 2003-04-14 | 2004-10-19 | Eastman Kodak Company | Compensation films for LCD |
JP2005062724A (en) * | 2003-08-20 | 2005-03-10 | Toshiba Matsushita Display Technology Co Ltd | Optical phase difference plate and liquid crystal display |
US7357511B2 (en) * | 2005-03-23 | 2008-04-15 | 3M Innovative Properties Company | Stress birefringence compensation in polarizing beamsplitters and systems using same |
JPWO2007105371A1 (en) * | 2006-03-13 | 2009-07-30 | セイコーエプソン株式会社 | Liquid crystal device and projector provided with the same |
JP2008083546A (en) * | 2006-09-28 | 2008-04-10 | Stanley Electric Co Ltd | Liquid crystal display device |
KR100781708B1 (en) * | 2006-10-12 | 2007-12-03 | 삼성전자주식회사 | Flexible display unit and mobile terminal having the same |
US20080225212A1 (en) * | 2007-03-13 | 2008-09-18 | Ong Hiap L | Pixel designs for multi-domain vertical alignment liquid crystal display |
US20090322800A1 (en) | 2008-06-25 | 2009-12-31 | Dolby Laboratories Licensing Corporation | Method and apparatus in various embodiments for hdr implementation in display devices |
JP2014206622A (en) * | 2013-04-12 | 2014-10-30 | セイコーエプソン株式会社 | Liquid crystal device driving method, liquid crystal device, electronic apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2171549A (en) * | 1985-02-15 | 1986-08-28 | Citizen Watch Co Ltd | Liquid crystal display device |
US4984873A (en) * | 1987-08-31 | 1991-01-15 | Ricoh Company, Ltd. | Liquid crystal display device |
EP0524028A1 (en) * | 1991-07-19 | 1993-01-20 | Nippon Oil Co. Ltd. | Viewing angle compensator for liquid crystal display |
US5184236A (en) * | 1990-08-10 | 1993-02-02 | Casio Computer Co., Ltd. | Twisted nematic liquid crystal display device with retardation plates having phase axis direction within 15° of alignment direction |
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JPS4946954A (en) * | 1972-09-11 | 1974-05-07 | ||
US4385806A (en) * | 1978-06-08 | 1983-05-31 | Fergason James L | Liquid crystal display with improved angle of view and response times |
JPS5545037A (en) * | 1978-09-26 | 1980-03-29 | Citizen Watch Co Ltd | Liquid crystal display device |
JPS5670524A (en) * | 1979-11-13 | 1981-06-12 | Sharp Corp | Twisted nematic liquid crystal display unit |
JPS60146590A (en) * | 1984-01-10 | 1985-08-02 | Citizen Watch Co Ltd | Polychromatic image display device |
US4632514A (en) * | 1984-01-31 | 1986-12-30 | Matsushita Electric Industrial Co., Ltd. | Color liquid crystal display apparatus |
US4652088A (en) * | 1984-02-01 | 1987-03-24 | Hitachi, Ltd. | Liquid crystal display device |
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US4995704A (en) * | 1988-07-08 | 1991-02-26 | Kabushiki Kaisha Toshiba | Liquid crystal display device |
EP0350075A3 (en) * | 1988-07-08 | 1990-09-05 | Kabushiki Kaisha Toshiba | Liquid crystal display device |
JP2856401B2 (en) * | 1988-07-08 | 1999-02-10 | 株式会社東芝 | Liquid crystal display device |
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JP2721284B2 (en) * | 1991-02-07 | 1998-03-04 | 株式会社東芝 | Liquid crystal display element and optically anisotropic element |
US5237438A (en) * | 1991-05-02 | 1993-08-17 | Casio Computer Co., Ltd. | Liquid crystal display device |
US5227903A (en) * | 1991-09-20 | 1993-07-13 | Casio Computer Co., Ltd. | Liquid crystal display device with at least one biaxial retardation film having nx >nz >ny |
US5196953A (en) * | 1991-11-01 | 1993-03-23 | Rockwell International Corporation | Compensator for liquid crystal display, having two types of layers with different refractive indices alternating |
TW229279B (en) | 1992-06-18 | 1994-09-01 | Casio Computer Co Ltd | |
US5344916A (en) * | 1993-04-21 | 1994-09-06 | The University Of Akron | Negative birefringent polyimide films |
US5570214A (en) | 1993-12-15 | 1996-10-29 | Ois Optical Imaging Systems, Inc. | Normally white twisted nematic LCD with retardation films on opposite sides of liquid crystal material for improved viewing zone |
US5576861A (en) * | 1993-12-15 | 1996-11-19 | Ois Optical Imaging Systems, Inc. | Liquid crystal display having a retarder with 100-200nm retardation and having high contrast viewing zone centered in positive or negative vertical region |
US5594568A (en) | 1993-12-15 | 1997-01-14 | Ois Optical Imaging Systems, Inc. | LCD with a pair of retardation films on one side of normally white liquid crystal layer |
US5657140A (en) | 1993-12-15 | 1997-08-12 | Ois Optical Imaging Systems, Inc. | Normally white twisted nematic LCD with positive and negative retarders |
-
1994
- 1994-06-08 US US08/255,971 patent/US5576861A/en not_active Expired - Lifetime
-
1995
- 1995-06-07 AT AT95108743T patent/ATE214492T1/en active
- 1995-06-07 DE DE69525790T patent/DE69525790T2/en not_active Expired - Lifetime
- 1995-06-07 EP EP95108743A patent/EP0686869B1/en not_active Expired - Lifetime
- 1995-06-08 CA CA002151291A patent/CA2151291C/en not_active Expired - Fee Related
-
1996
- 1996-11-12 US US08/747,671 patent/US5737048A/en not_active Expired - Lifetime
-
1998
- 1998-03-26 US US09/048,322 patent/US6229588B1/en not_active Expired - Lifetime
-
1999
- 1999-06-16 US US09/334,267 patent/US6226065B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2171549A (en) * | 1985-02-15 | 1986-08-28 | Citizen Watch Co Ltd | Liquid crystal display device |
US4984873A (en) * | 1987-08-31 | 1991-01-15 | Ricoh Company, Ltd. | Liquid crystal display device |
US5184236A (en) * | 1990-08-10 | 1993-02-02 | Casio Computer Co., Ltd. | Twisted nematic liquid crystal display device with retardation plates having phase axis direction within 15° of alignment direction |
EP0524028A1 (en) * | 1991-07-19 | 1993-01-20 | Nippon Oil Co. Ltd. | Viewing angle compensator for liquid crystal display |
Also Published As
Publication number | Publication date |
---|---|
US5576861A (en) | 1996-11-19 |
ATE214492T1 (en) | 2002-03-15 |
US5737048A (en) | 1998-04-07 |
US6229588B1 (en) | 2001-05-08 |
EP0686869A2 (en) | 1995-12-13 |
EP0686869B1 (en) | 2002-03-13 |
CA2151291A1 (en) | 1995-12-09 |
DE69525790D1 (en) | 2002-04-18 |
CA2151291C (en) | 2006-01-03 |
US6226065B1 (en) | 2001-05-01 |
DE69525790T2 (en) | 2002-11-21 |
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